/* windows support functions
 * 
 * here include windows.h for implementation. note, general code
 * cannot.
 */

#include <windows.h>
#include <time.h>

#define DELTA_EPOCH_IN_MICROSECS  11644473600000000Ui64
 
struct timezone 
{
  int  tz_minuteswest; /* minutes W of Greenwich */
  int  tz_dsttime;     /* type of dst correction */
};
 
int gettimeofday(struct timeval *tv, struct timezone *tz)
{
  FILETIME ft;
  unsigned __int64 tmpres = 0;
  static int tzflag;
 
  if (NULL != tv)
  {
    GetSystemTimeAsFileTime(&ft);
 
    tmpres |= ft.dwHighDateTime;
    tmpres <<= 32;
    tmpres |= ft.dwLowDateTime;
 
    /*converting file time to unix epoch*/
    tmpres -= DELTA_EPOCH_IN_MICROSECS; 
    tmpres /= 10;  /*convert into microseconds*/
    tv->tv_sec = (long)(tmpres / 1000000UL);
    tv->tv_usec = (long)(tmpres % 1000000UL);
  }
 
  if (tz)
  {
      if (!tzflag)
      {
          _tzset();
          tzflag++;
      }
      tz->tz_minuteswest = _timezone / 60;
      tz->tz_dsttime = _daylight;
  }
 
  return 0;
}

 
